bg-counting Published 11 March 2016 at 1050 × 450 in You can count on Dirichlet ← Previous The divisors of the integers. Banner for James’s Dirichlet counting article Jigsaw Jigsaw is a talented chess player and fervent climber. All articles by Jigsaw More from ChalkdustThings to makePlatonic shapes from tube maps, flexagons, and more mathematical craftWhat’s hot and what’s notOptimal Pac-ManGhostbusting with graph theoryReinventing 2DWhat a difference a matrix makesYour social networksHow similar are you to your friends?Art meets maths